![]() Weirs not sharp crested are classified according to the shape of their cross section, such as broad-crested weirs, triangular weirs, and trapezoidal weirs. Sharp-crested weirs are classified according to the shape of the weir opening, such as rectangular weirs, triangular or V-notch weirs, trapezoidal weirs, and parabolic weirs. If the discharge is partly under water, the weir is submerged or drowned.Ī weir with a sharp upstream corner or edge such that the water springs clear of the crest is a sharp-crested weir.Īll other weirs are classed as weirs not sharp crested. If the nappe discharges into the air, the weir has free discharge. The overflowing sheet of water is the nappe. The edge or surface over which the water flows is called the crest. Weir is defined as a barrier over which the water flows in an open channel. ![]()
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